Continental Shelf - The gently sloping, shallow ocean floor at the edge of the continent., Continental Slope - The steep drop off at the edge of the continent. , Trench - A deep Valley at a subduction zone. , Mid Ocean Ridge - An underwater mountain range formed from seafloor spreading , Volcanic Island - An underwater volcano that has risen above sea level. , Sea mount - A mountain rising from the ocean seafloor that does not reach the water's surface., Abyssal Plain - Flat areas of the deep ocean floor. ,

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